warren



Feb. 7, 1956 WARREN 2,733,958

WATER SPRINKLER Filed June 8, 1955 A 2 Sheets-Sheet l fimnv GLENNM/ARRfN INVENTOR.

Feb. 7, 1956 H. G. WARREN 2,733,958

WATER SPRINKLER Filed June 8, 1953 2 Sheets-Sheet 2 3 INVENTOR.

ATTORNEY HARRY GLEN/v WARREN United States Patent This invention relatesto a water sprinkler, and particularly to the type of sprinkler adaptedto oscillate between fixed limits and water a predetermined sector of alawn.

Conventional lawn sprinklers of the pivoting or oscillating type aresubject to numerous disadvantages tending to make them unsuitable formany types of operation. Some such sprinklers, for example, have a sidespray which may wet undesired locations such as sidewalks, and whichprevents an operator from approaching the sprinkler, in order to move itto a new location, without turning ofi the water. Furthermore, manysprinklers of the oscillating type are characterized by an objectionablyloud sharp click at the end of each oscillation. In addition to theabove, many sprinklers presently known are not adjustable to vary theangle of the sector to be sprinkled, are not adjustable as to rate ofoscillation except by varying the volume of sprinkled water, and do notefiect an even distribution of water over the area. More importantly,certain types of oscillating sprinklers tend to assume a dead centerposition at which oscillation is stopped, so that further pivotingmovement is dependent upon manual actuation of the sprinkler head pastthe dead center position.

In view of the above factors characterizing the field of oscillatinglawn sprinklers, it is an object of the present invention to provide anoscillating sprinkler head having overcenter means to prevent the headfrom assuming a dead center position, so that continued oscillation isassured under all conditions of operation.

A further object of the invention is to provide a sprinkler which issubstantially noiseless in operation, is adjustable as to speed withoutvarying the water pressure or volume, and is readily adjusted tosprinkle from a fixed position to any sector of a complete circle.

An additional object is to provide an automatic sprinkler effecting aneven water distribution over the area being covered, and free fromobjectionable side spray tending to deter an operator from approachingthe sprinkler when the water is on.

A further object is to provide a sprinkler head which is simple andreliable in operation in that it has only a single large jet, tominimize the possibility of clogging, and is provided with a novelthrust bearing structure to insure substantially frictionless pivotingand long life.

These and other objects and advantages of the invention will be morefully set forth in the following specification and claims considered inconnection with the attached drawings to which they relate.

In the drawings:

Figure 1 is a top plan view of the operating portion of the sprinkler;

Figure 2 is a side elevational view of the showing of Figure 1;

Figure 3 is a transverse sectional view along line 3-3 of Figure 1 andillustrating the reversing arm and overcenter yoke;

'ice

Figure 4 is an end view at line 4-4 of Figure 2 and illustrating thedeflector member;

Figure 5 is a perspective view of the deflector;

Figure 6 is a vertical section along line 6--6 of Figure 1 and showingthe internal passages and bearings of the sprinkler head;

Figure 7 is a fragmentary view along line 7-7 of Figure 6 and as viewedin the direction of the arrows;

Figure 8 is a plan view illustrating the mounting of the workingcomponents of the sprinkler on a base, the showing being reduced insize;

Figure 9 is an elevational view of the showing of Figure 8; and

Figures 10 and 11 are detail views of the deflector.

Referring to the drawings, the sprinkler is seen to comprise a base 10(Figures 8 and 9), a stationary journal boss 11 extending upwardly fromthe base, a nozzle 12 rotatably associated with the journal boss, anddeflector means 13 mounted on the upper portion of nozzle 12 and movablebetween close limits. The invention further comprises means 14 to adjustthe limits of movement of the deflector means and thus the speed ofpivoting of nozzle 12, an overcenter yoke 16 to prevent the deflectormeans from assuming a dead center position resulting in cessation ofnozzle movement, and stop means 17 which cooperate with the overcenteryoke and are operable to adjust the sector of nozzle oscillation andthus the area of lawnbeing watered.

Referring to Figures 8 and 9, the base 10 is illustrated as athree-legged type having two solid legs 19 and a hollow leg 20, thelatter being adapted with a coupling 21 for connection to a water hose.The hollow center portion 22 of base 10 is internally threaded toreceive the vertically projecting journal boss 11, the lower end ofwhich is provided with external threads 23.

As best shown in Figures 2 and 6, the journal boss 11 is formed abovethreads 23 with a hexagonal portion 25 for a wrench hold, and at itsupper end with a relatively large diameter flange portion 26 whichserves as a mounting for the stop means 17 as will be described subsequently. An axial passage 2'7 is provided in the journal boss to receivea vertical shaft tube 28, the passage 27 opening out into a ball chamber29 inwardly of flange 26.

It is a feature of the invention that substantially frictionless thrustbearing means are provided to absorb the pressure of water passingupwardly through tube 28 and out nozzle 12, these means comprising aplurality of stainless steel balls 31 mounted in ball chamber 29circumferentially of shaft 28. When there is no water passing throughthe nozzle, the balls 31 seat partially on the correspondingly curvedlower wall of ball chamber 29, and partially on a conical ball seat 32formed on the shaft tube. When, however, water is passing through thesprinkler, pressure of the water against nozzle 12 operates to lift thenozzle and shaft tube 28 until the balls 31 seat on a horizontal thrustwasher 33 mounted across the upper end of the journal boss and retainedin place by a snap ring 34.

With the above arrangement, the nozzle 12 and shaft tube 28 mayoscillate without substantial friction, the water pressure beingabsorbed by the balls 31 riding between bearing cone 32, thrust washer33, and the cylindrical outer wall of ball chamber 29. The lateralbearings for the shaft tube 28 are provided at the open center of thrustwasher 33 and at the necked down lower end 36 of the journal boss.Suitable sealing means, taking the form of a packing ring 37 andretaining ring 38, are seated in end 36 to prevent leakage of water intoball chamber 29 and around washer 33 to the atmosphere.

The nozzle 12 comprises a generally cylindrical base portion 40 and aradial arm portion 41 which extends outwardly and upwardly for asubstantial distance from 'arsasss the base, the arm being, for example,at a one hundred five degree angle from the vertical shaft tube.

The nozzle base 40 is threaded downwardly over the upper end of shafttube 28, and is formed with a vertical "water passage 42Whichcommunicates with a relatively smaller water passage 43 extendingaxially through arm 41. A Water path is thus formed from a hose throughleg 20 of base 10, base center 22, shaft tube 26, and

passages 42 and 43 for distribution over the lawn being sprinkled. Atthe outer end of passage 42, which ispreferably of the same internaldiameter as shaft 2%, is a bushing 44 press fitted into arm 41. Bushingis shaped to provide a reduced diameter, yet relatively large andclog-resistant, discharge opening for the water jet.

The deflector means 13 comprise a shaft 45 journaled parallel to arm 41,and in spaced relation above it, by means of journal lugs 46 and 47integral with the inner andouter ends of the nozzle arm, a deflector i3dependmounted on shaft 45 as by a transverse pin 52 (Figure 2), and witha deflecting portion 53 disposed adjacent the discharge opening at theouter end of arm 41. Deflector portion 53 takes the form of a triangularblock having a substantially vertical apex edge 54 disposed atapproximately the center of the jet discharge opening. The twodeflecting faces 56 and 57 of deflector portion extend, as shown inFigure 7, from apex 54 and to the outer edge of the block, the includedangle between the deflecting faces being on the order of thirty degrees.When apex 54 is exactly at the center of the nozzle opening, the waterjet divides equally on faces 56 and 57 and, the deflection angles andvolumes of the jet components being equal, there is no resultant pivotalforce in either direction. When, however, the apex is moved to one sideof the axis of passage 43, the water jet will divide into unequalportions which will deflect at equal angles on opposite sides of avertical plane containing the jet axis. There will then be a resultantreaction force tending to pivot the nozzle in a direction away from thecomponent of the jet containing the largest volume of water. 'It followsthat when the apex is to the left of dead center as viewed in Figure 4,the nozzle will rotate clockwise as viewed from the top (Figure 1), andwhen the apex is at the right of center the nozzle will rotatecounterclockwise.

Referringparticularly to Figures 2 and 3, the necessary .movement ofdeflector43 is effected through shaft 45 by means of reversing arm 49,which is generally hookshaped as viewed in Figure 3. The upper or shankend ti of the reversing arm is mounted on shaft 45, and the lower orhook portion of the arm is curved beneath nozzle portion 41 as shown,sufficient clearance being provided to permit'substantial pivotalmovement of the reversing arm on its shaft. Shankend 6b of reversing arm4? serves a second function of limiting the axial displacement ofdeflector shaft 415, so that deflector 48 is always spaced a sufiicientdistance in advance of nozzle 41 to prevent rubbing contact. For thispurpose the shank oil, which is secured on shaft 45 by a set screw 61,is disposed between the inner journal lug 46 and a stop ear 62projecting from the upper portion of nozzle base 49 adjacent the end ofshaft 45.

The speed control means 14 which determine the limits of deflection ofreversing amt-i9 by the overcenter yoke 16 and stop means 17, to bedescribed subsequently, comprise a screw '64 threaded parallel to nozzlearmdl through a depending lug 65 formed integral with the lower innerportion of the nozzle arm. The inner end of speed control screw 64,rela'tively adjacent nozzle base 40, is generally conical in shape'andexte'nds through a circular hole 66 formed in the lower portionofreversing arm 49 as best shown in Figure 3. With this arrangement, theamount of deflection of reversing arm d9 may be precisely controlled bymerely turning the adjustment screw 64 to either advance or retract theconical screw end relative to hole 66. The off-center position of thedeflector apex 54, and thus the amount of reaction force and speed ofnozzle pivoting, are in this way controlled with great accuracy.

As shown in Figure 6, the center portion 67 of screw 64 is not threaded,and is adapted to cooperate with a suitable spring clip 68 mountedaround it and in a vertical slot 69 in lug 65. Clip 68 serves to preventcomplete displacement of the adjustment screw from the lug, and also toprevent excessive threading of the conical end into reversing armaperture 66.

The overcenter yoke 16 comprises a generally annular horizontal bodyportion 71 mounted loosely around shaft tube 23, and a horizontal shelfportion 72 formed integral with body '71 beneath reversing arm 49. Thebody '71 is pivotally connected, remote from shelf 72, to a boss portion"73 of nozzle base 40, this connection taking the form of the verticalscrew 74 and bushing 75 illustrated in Figure 6. The shelf portion 72 ofthe overcenter yoke serves as a mounting for a pair of laterally spacedears '76 and 77 (Figure 3) adapted to cooperate with a lug 78 formed onreversing arm 49 beneath hole 66. An overcenter spring 83, for exampleof the type employed on the shutters of inexpensive box cameras, ismounted between nozzle base 4i) and yoke shelf 72 to insure that theyoke never remains at dead center but instead only stops at one of theextreme positions illustrated in solid and dashed lines in Figure 3.

The stop means 17 comprise a pair of vertically spaced annular springelements 32 and 83 mounted, respectively, in upper and lower peri heralgrooves in flange 26 of journal boss The ends of the spring SZ'projectradially from the annular body of the spring to form a stop arm S i,While the ends of spring 83 project correspondingly to form a stop arm85. Each of the stop arms 8d and d5 may be set at any rotated positionmerely through manually shifting, the spring pressure between eachspring body and its mounting groove being sufiicient to frictionallymaintain the stop arm at the desired angle. Stop arms 84 and 35cooperate with a vertical yoke arm 37 which depends from yoke shelfportion 72 midway between ears 7'5 and 77. With the describedarrangement, the yoke i6, and thus vertical arm 87, pivots with nozzle12 due to action of the overcenter spring 80, and until the art $7engages one or the other of stop arms $4 and When a stop arm is engaged,the .yoke is held and the nozzle moves relative thereto until theoverccnter spring 86' becomes operative to throw the yoke to theopposite position. An ear 7a or '77 thenacts through lug '78 to changethe position of reversing arm d9, which acts through shaft 45 to pivotdeflector element 4% and in this way reverse the direction of nozzlerotation. it may thus be seen that the sector of rotation of the nozzle12, and thus the area of lawn covered,may be precisely controlled merelyby shifting the stop arms h and 85 to any desired position, so that theangle of nozzle pivotingmay be varied between zero and three hundredsixty degrees.

In the operation of the automatic sprinkler head, let it be assumed thatovercenter yoke 16 is initially in the left or solid line position shownin Figure 3, "so that car '77 acts on lug 78 to maintain reversing 'arm49 in its clockwise pivoted position. At this time the nozzle 12 may bein any rotated position, for example midway be- 80. Prior to the passingof water through the sprinkler the shaft tube 23 isin the'lower'position shown in Figure 6, with the bearing cone 32 resting onashoulder-in journal boss 11 and with the bearing balls 31 out ofengagement with thrust washer 33.

When a hose is connected to the coupling 21, and the water turned on,water passes through hollow leg and base center portion 22, thenupwardly through shaft tube 28 and into vertical passage 42 in nozzlebase 40. As the water strikes the upper end wall of passage 42 it exertsa substantial lifting force which elevates the nozzle 12 and shaft tube28, so that bearing cone 32 is lifted to shift the bearing balls 31upwardly into engagement with thrust washer 33. The thrust of the wateris thus taken entirely by the bearing balls, and a substantiallyfrictionless bearing is provided by the bearing balls which roll betweencone 32 and the thrust washer. From passage 42 the water is deflectedinto the axial passage 43 in nozzle arm 41, this passage being ofsubstantial diameter to provide a relatively large single jet of water.

As the water discharges from passage 43 it divides along the apex edge54 of the triangular block 53, so that the single water jet is separatedinto two components one of which impinges on face 56 and the other onface 57 illustrated in Figure 7. Because of the initial positioning ofreversing arm 49 as described above, the apex edge 54 is to the left ofcenter as viewed in Figure 4, or in the upper position as viewed inFigure 7. The jet component impinging upon face 57 (Figure 7) willtherefore be of larger volume than the component impinging upon face 56.It follows that the reaction force against face 57 will be greater thanthat against face 56 and a resultant pivotal force will be createdtending to rotate the nozzle clockwise as viewed from above in Figure l.The nozzle will then rotate clockwise as will the overcenter yoke 16which at this time is held by overcenter spring 80 against movementrelative to the nozzle. Clockwise rotation will continue until verticalyoke arm 87 comes into engagement with stop arm 84 to prevent furtherpivoting of the overcenter yoke, so that lug 78 on reversing arm 49moves out of engagement with yoke ear 77 and in the direction of the nowstationary ear 76. When ear 76 and lug 78 come into engagement thereversing arm 49 is pivoted to the dashed line position shown in Figure3, so that deflector shaft 45 and thus deflector 48 rotate until apexedge 54 is shifted to the opposite side of the discharge opening frompassage 43. The component of the water jet deflected off the face 56will then be of larger volume than that deflected off face 57 and aresultant force is created in the reverse direction. The nozzle thenpivots counterclockwise, as viewed from the top, until yoke arm 87engages stop arm 85 to reverse the action.

It is a feature of the invention that the speed of the pivotal movement,for any given water pressure, is dependent entirely upon the distancethat the apex edge 54 is moved away from a vertical plane containing theaxis of passage 43 and of the discharging water jet. When the apex edgeis only a slight distance off center, the volume of water deflected offthe corresponding face 56 or 57 will be only slightly greater than thatdeflected off the opposite face, so that a relatively small resultantreaction force will be created and the speed of pivoting will becorrespondingly slow. When, on the other hand, the apex is moved asubstantial distance from center, the relatively great difference inwater volume will result in a correspondingly increased reaction forceand the pivoting movement will be rapid. As previously described indetail, the limits of movement of apex edge 54 are accurately determinedby speed adjustment screw 64 the conical end of which is inserted in thehole 66 in reversing arm 49. When the conical end of screw 64 isthreaded a substantial distance into hole 66, the amount of pivoting ofthe reversing arm, and thus of deflector 48, will be extremely small andthe nozzle travel will be slow. To increase the speed of nozzlemovement, the screw 64 is turned in a direction to retract its conicalend from the reversing arm hole and increase the distance of permissiblemovement of the reversing arm and thus of the deflector. The aboveaction is to be compared with many sprinkler heads in which the speed ofnozzle rotation is governed by the water pressure, so that in order todecrease the speed it is necessary to decrease the water volume which isundesirable in many instances.

The amount of noise resulting from the reversing action is extremelysmall as compared to conventional sprinklers. This is because the onlymetallic contact is between vertical yoke arm 87 and the stop arms 84and 85, as well as between one or the other of ears 76 and 77 andreversing arm lug 78, these contacts being somewhat cushioned due to theresilience of the stop arms. When the nozzle is pivoting at relativelyhigh speed the reversing arm lug 78 will normally engage the yoke earswhile the yoke arm 87 is in contact with a stop arm 84 or 85. When,however, the nozzle travel is slow, the overcenter spring 80 may operateto pivot yoke 16 out of engagement with a stop arm 84 or 85 prior to theengagement of lug 78 with the opposite car. In the latter situation, theamount of noise is reduced since the force exerted by the water reversesto cushion the reversing action and results in substantially noiselessoperation. In any event, the spring 80 and yoke 16 insure that thereversing arm 49 will always be in an extreme position so that thedeflector 48 will remain otf center and continued nozzle pivotingassured.

Referring to Figures 10 and 11, it is a feature of the invention thatthe upper part of the jet or cone of water emanating from nozzle 12 iscut ofi or flattened in a highly novel manner, so that water in thisupper cone component travels a further distance and improves the patternof water distribution. This is accomplished by forming deflector body 51with longitudinal deflector faces in the form of triangularundersurfaces lying in a plane parallel to and spaced slightly above thepassage 43. The space between the inner edges of surfaces 90 and thedeflector faces 56 and 57 is formed to provide grooves 91. .In theoperation of this portion of the sprinkler, the upper components of thejet or cone of water are deflected along, and guided by, the surfaces 90and grooves 91 so that a flattened cone is provided and waterdistribution improved.

While the particular apparatus herein shown and described in detail isfully capable of attaining the objects and providing the advantageshereinbefore stated, it is to be understood that it is merelyillustrative of the presently preferred embodiments of the invention andthat no limitations are intended to the details of construction ordesign herein shown other than as defined in the appended claims.

I claim:

1. An automatic sprinkler head, which comprises a stationary base havingan upwardly extending journal boss, an axis tube journaled in said boss,a nozzle mounted on the upper portion of said axis tube and extending ina generally horizontal direction, said nozzle having a water passagecommunicating at its inner end with said axis tube and terminating atits outer end in a relatively large discharge opening, a deflector shaftjournaled on said nozzle and generally parallel thereto, a deflectormounted to the deflector shaft at the outer end thereof and disposedadjacent said discharge opening, said deflector having angularlydisposed deflector faces adapted to divide the water jet from saiddischarge opening into two components one of which is deflected to oneside of a vertical plane containing the axis of said jet and the otherof which is deflected to the other side of said vertical plane, areversing arm mounted to the deflector shaft at the inner end thereofand movable to shift the position of said deflector, adjustable speedcontrol means to limit the movement of said reversing arm to betweenfirst and second positions at which the volume of water in said one jetcomponent is alternately greater and lesser than the volume in saidother jet component, said speed control means comprising a screw'threadedly mounted for movement with said nozzle and having a taperedend loosely inserted in a "boss, an axis tube journaled in said boss,the upper end of said journal boss being recessed to provide a ballchamber, a plurality of balls in said ball chamber around said axistube, a ball seat on said axis tube beneath said balls, a thrust washermounted over the upper end of said journal boss, a nozzle mounted on theupper portion of said axis'tube and extending in a generally horizontaldirection, said nozzle having a water passage communicating at its innerend with said axis tube and terminating at its outer end in a relativelylarge discharge opening, said thrust washer serving as a racefor saidballs when said nozzle, axis tube and ball seat are elevated due toreaction of Water against said nozzle, a deflectorshaft journaled onsaid nozzle and generally parallel thereto, a deflector mounted to thedeflector shaft at the outer end thereof and disposed adjacent saiddischarge opening, said deflector having angularly disposed deflectorfaces adapted to divide the Water jet from said discharge opening intotwo components one of which is deflected to one side of a vertical planecontaining the axis of said jet and the other of which is deflected tothe other side of said vertical plane, a reversing arm mounted to saiddeflector shaft at the inner end thereof and movable to shift theposition of said deflector, adjustable speed control means to limit themovement of said reversing arm to between first and second positions atwhich the volume of'water in said one jet component is alternatelygreater and lesser than the volume in said other jet component, and apair of stop arms mounted on said journal boss and operably associatedwith said reversing arm to shift the same between said first and secondpositions.

3. An automatic water sprinkler head, which cornprises a stationary basehaving an upwardly extending journal boss, an axis tube journaled insaid boss, a nozzlcmounted on the upper portion of said axis tube andextending in a generally horizontal direction, said nozzle having aWater passage communicating at its inner end with said axis tube andterminating at its outer end in a relatively large discharge opening, adeflector shaft journaled on said nozzle and generally parallel thereto,a deflector mounted to the deflector shaft at the outer end thereof anddisposed adjacent said discharge opening, said deflector havingangularly disposed deflector faces adapted to divide the water jet fromsaid discharge opening into two components one of which is deflected toone side of a vertical plane containing the axis of said jet and theother of which is deflected to the other side of said vertical plane, areversing arm mounted to the deflector shaft at the inner end thereofand movable to shift the position of said deflector, a lug on saidreversing arm, adjustable speed control means to limit the movement ofsaid reversing arm to between first and second positions at which thevolume of water in said one jet component is alternately greater andlesser than the volume in said other jet component, a yoke pivotallymounted on said nozzle and operably associated with said reversing arm,a pair of ears on said yoke spaced on opposi e sides of said lug on thereversing arm for alternate engagement therewith, and a pair ofadjustable stops mounted on said journal boss and operably associatedwith said yoke, an arm on said yoke so disposed and arranged as toalternately engage said adjustable stops, each of said stops operatingthrough said yoke to 'eifectmovem'ent of said reversing arm between saidfirst and second positions, and an overcenter spring connected to saidnozzle, said overcenter spring being adapted to maintain said yoke in anextreme position relative to said nozzle until engagement of said yokearm with one of said adjustable stops.

4. An automatic water sprinkler head, which comprises a stationary basehaving an upwardly extending journal boss, an axis tube journaled insaid boss, a nozzle mounted on the upper portion of said axis tube andex tending in a generally horizontal direction, said nozzle having aWater passage communicating at its inner end with said axis tube andterminating at its outer end in a relatively large discharge opening, adeflector shaft journaled on said nozzle and generally parallel thereto,a deflector mounted to the deflector shaft at the outer end thereof anddisposed adjacent said discharge opening, said deflector havingangulariy disposed deflector faces adapted to divide the water jet fromsaid discharge opening into two components one of which is deflected toone side of a vertical plane containing the axis of said jet and theother of which is deflected to the other side of said vertical plane,longitudinal deflector faces on said deflector which lie in a planeparallel to and slightly above said jet axis, and grooves lyingrespectively along said angularly disposed deflector faces and at theirjunctions with said longitudinal deflector faces, said grooves andlongitudinal deflector faces serving to improve the distribution ofwater in the upper portion of said jet, a reversing arm mounted to thedeflector shaft at the inner end thereof and movable to shift theposition of said deflector, adjustable speed control means to limit themovement of said reversing arm. to between first and second positions atwhich the volume of water in said one jet component is alternatelygreater and lesser than the volume in said other jet component, a yokepivotally mounted on said nozzle and operably associated with saidreversing arm, and a pair of adjustable stops mounted on said journalboss and operably associated with'said yoke, each of said stopsoperating through said yoke to effect movement of said reversing armbetween said first and second positions.

An automatic water sprinkler head, which comprises a stationary basehaving an upwardly extending journal boss, an axis tube journaled insaid boss, a nozzle mounted on the upper portion of said axis tube andextending in a generally horizontal direction, said nozzle having awater passage communicating at its inner end with said axis tube andterminating at its outer end in a relatively large discharge opening, adeflector shaft journaled on said nozzle and generally parallel thereto,a deflector mounted to the deflector shaft at the outer end thereof anddisposed adjacent said discharge opening, said deflector havingangularly disposed deflector faces adapted to divide the water jet fromsaid discharge opening into two components one of which is deflected toone side of a vertical plane containing the axis of said jet and theother of which is deflected to the other side of said vertical plane, areversing arm mounted to the deflector shaft at the inner end thereofand movable to shift the position of said deflector, said reversing armhaving a hole therein, adjustable speed control means to limit themovement of said reversing arm to between first and second positions atwhich the volume of Water in said one jet component is alternatelygreater and lesser than the volume in said other jet component, saidspeed control means comprising a screw having a tapered end, said screwbeing threadedly mounted to the nozzle so as to be shiftable in and outof the hole in the reversing arm whereby the movement of the reversingarm transverse to the screw is progressively restricted by theprogressive insertion of the tapered end of the screw into the hole inthe reversing arm,'thereby adjusting theextreme positions of thedeflector to determine the relative volumes in the jet components, ayoke pivotally mounted on said nozzle and operably associated with saidreversing arm,

tions.

References Cited in the file of this patent UNITED STATES PATENTS BarnesApr. 22, 1924 10 Schneider May 14, 1929 Buckner June 23, 1931 10 NorlandMar. 13, 1934 Buckner Mar. 28, 1944 Dunham June 3, 1947 Phillips June 3,1952 Sciuto Apr. 6, 1954 Campbell Oct. 12, 1954 FOREIGN PATENTSSwitzerland Jan. 3, 1945 Germany Oct. 31, 1933

